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4 years ago

Light is not a wave because it does not need a medium

2 answers:

7 0

It's a tough question as to whether light is a wave or a particle..

The statement is FALSE. Not all types of waves need a medium to propagate. Light can travel without a medium.

Extra Information:
Light is a longitudinal wave, sound is transverse.
Longitudinal waves do not need a medium.
Transverse waves need a medium.
This is why, for example, in the vacuum of space, light travels from stars, but sound does not.

ss7ja [257]4 years ago

5 0

the asnwer is false........

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B. A car moving at an initial speed vi applies its brakes and skids for some distance until coming to a complete stop. If the co

wariber [46]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The distance which the car skid is $l = \frac{v_i^2 }{2 * \mu_k * g }$

Explanation:

From the question we are told that

The initial velocity of the car is $v_i$

The coefficient of kinetic friction is $\mu_k$

According to the law of energy conservation

The initial Mechanical Energy = The final Mechanical Energy

$M_i = M_f$

The initial mechanical energy is mathematically represented as

$M_i = KE _o + PE_e$

where KE is the initial kinetic energy which is mathematically represented as

$KE = \frac{1}{2} m v_i^2$

And PE is the initial potential energy which is zero given that the car is on the ground

Now

$M_f = W_{\mu}$

Where $W_{\mu}$ is the work which friction exerted on the car which is mathematically represented as

$W_{\mu} = m* \mu_k * g * l$

Where $l$ is the distance covered by the car before it slowed down

$\frac{1}{2} m v_i^2 = m* \mu_k * g * l$

=> $l = \frac{v_i^2 }{2 * \mu_k * g }$

3 0

4 years ago

A thin flake of mica ( n = 1.58 ) is used to cover one slit ofa double slit interference arrangement. The central point on thevi

ELEN [110]

Answer:

the thickness of the mica is 6.64μm

Explanation:

By definition we know that the phase between two light waves that are traveling on different materials (in this case also two) is given by the equation

$\Phi = 2\pi(\frac{L}{\lambda}(n_1-n_2))$

Where

L = Thickness

n = Index of refraction of each material

$\lambda = Wavelength$

Our values are given as

$\Phi = 7(2\pi)L=tn_1 = 1.58n_2 = 1\lambda = 550nm$

Replacing our values at the previous equation we have

$\Phi = 2\pi(\frac{L}{\lambda}(n_1-n_2))7(2\pi) = 2\pi(\frac{t}{\lambda}(1.58-1))$

$t = \frac{7*550}{1.58-1}\\t = 6637.931nm \approx 6.64\mu m$

the thickness of the mica is 6.64μm

5 0

3 years ago

Under specific circumstances, waves will bend around obstacles. This type of bending is called

BartSMP [9]

That type of bending is called "diffraction" of waves.

6 0

3 years ago

Please answer correctly<br>will give the brainliest<br>Urgent

EastWind [94]

Answer:

f (frequency) = V / y where V is the speed of sound and y the wavelength

f = 1500 m/s / 1.5 m = 1000 / sec

T (period) = 1 / f = .001 sec

Suppose you replace the horn by a drum then the period would be the time between the beats of the drum - now if the source is moving towards the observer then the distance between crests of the wave produced by the drum will be shortened by V * T because of the motion of the drum "towards" the observer, and since the wavelength is shorter the frequency heard by the observer will be higher, and the higher the speed of of the car the shorter the wavelength as seen by the observer and the higher the frequency.

Also, if the car is moving away from the observer then the distance between the crests of the wave emitted will be further apart, and the observer will hear a lower frequency.

3 0

3 years ago

Why do astronauts muscles weaken?

Pavlova-9 [17]

They work on a weightless planet, therefore they have very little muscle control since they float in space !!

3 0

4 years ago